As the Senate prepares for Thursday’s hearing on plummeting deportation rates and increasing criminal alien releases, an anonymous whistleblower is now speaking out about alleged waste and abuse of taxpayer funds within a federal immigration enforcement agency.

The whistleblower says that these “abuses clearly threaten” the ability of the nation’s immigration officers to enforce immigration law and keep the American people safe.

The anonymous whistleblower, who serves as a member of a federal immigration agency, has filed a report with the Office of Special Counsel alleging fraud, waste, and abuse within the Enforcement and Removal Operations (ERO) division of Immigration and Customs Enforcement (ICE). In the report, which has been obtained exclusively by Breitbart News, the whistleblower estimates that the waste could be costing U.S. taxpayers up to $27.5 million annually, and could involve up to 500 federal agents.

“The situation I now report has been ongoing for years, and the abuses clearly threaten the mission readiness of a federal law enforcement agency with a key public safety and national security mission,” the whistleblower writes. “The estimated amount of fraud, waste and abuse in one year is $12.5M – $27.5M. The estimated number of ICE ERO supervisors involved is between 250-500.”